JSFiddle - React, Tailwind, and code Playground

HTML

<select id='ItemType'>
    <optgroup label="Florida Atlantic University">
        <option value="1">Text</option>
        <option value="2">Text</option>
        <option value="3">Text</option>
    </optgroup>
    <optgroup label="Florida Tech">
        <option value="4">Text</option>
        <option value="5">Text</option>
        <option value="6">Text</option>
    </optgroup>
</select>

JavaScript

$('ItemType).filter('[optgroup[label*="' + itemgroup + '"]');